source/core/texturecube.cpp

   1 #include <msp/datafile/collection.h>
   2 #include <msp/gl/extensions/arb_direct_state_access.h>
   3 #include <msp/gl/extensions/arb_seamless_cube_map.h>
   4 #include <msp/gl/extensions/arb_texture_cube_map.h>
   5 #include <msp/gl/extensions/arb_texture_storage.h>
   6 #include <msp/io/memory.h>
   7 #include <msp/strings/format.h>
   8 #include "bindable.h"
   9 #include "error.h"
  10 #include "pixelstore.h"
  11 #include "texturecube.h"
  12
  13 using namespace std;
  14
  15 namespace Msp {
  16 namespace GL {
  17
  18 TextureCubeFace TextureCube::face_order[6] =
  19 {
  20         POSITIVE_X,
  21         NEGATIVE_X,
  22         POSITIVE_Y,
  23         NEGATIVE_Y,
  24         POSITIVE_Z,
  25         NEGATIVE_Z
  26 };
  27
  28 Vector3 TextureCube::directions[6] =
  29 {
  30         Vector3(1, 0, 0),
  31         Vector3(-1, 0, 0),
  32         Vector3(0, 1, 0),
  33         Vector3(0, -1, 0),
  34         Vector3(0, 0, 1),
  35         Vector3(0, 0, -1)
  36 };
  37
  38 unsigned TextureCube::orientations[12] =
  39 {
  40         5, 3,
  41         4, 3,
  42         0, 4,
  43         0, 5,
  44         0, 3,
  45         1, 3
  46 };
  47
  48 TextureCube::TextureCube():
  49         Texture(GL_TEXTURE_CUBE_MAP),
  50         size(0),
  51         allocated(0)
  52 {
  53         static Require _req(ARB_texture_cube_map);
  54         if(ARB_seamless_cube_map)
  55                 glEnable(GL_TEXTURE_CUBE_MAP_SEAMLESS);
  56 }
  57
  58 void TextureCube::storage(PixelFormat fmt, unsigned sz, unsigned lv)
  59 {
  60         if(size>0)
  61         {
  62                 if(fmt!=format || sz!=size || (lv && lv!=levels))
  63                         throw incompatible_data("TextureCube::storage");
  64                 return;
  65         }
  66         if(sz==0)
  67                 throw invalid_argument("TextureCube::storage");
  68
  69         set_format(fmt);
  70         size = sz;
  71         levels = get_n_levels();
  72         if(lv>0)
  73                 levels = min(levels, lv);
  74 }
  75
  76 void TextureCube::allocate(unsigned level)
  77 {
  78         if(size==0)
  79                 throw invalid_operation("TextureCube::allocate");
  80         if(level>=levels)
  81                 throw invalid_argument("TextureCube::allocate");
  82         if(allocated&(64<<level))
  83                 return;
  84
  85         if(ARB_texture_storage)
  86         {
  87                 Conditional<BindRestore> _bind(!ARB_direct_state_access, this);
  88                 if(ARB_direct_state_access)
  89                         glTextureStorage2D(id, levels, storage_fmt, size, size);
  90                 else
  91                         glTexStorage2D(target, levels, storage_fmt, size, size);
  92                 apply_swizzle();
  93                 allocated |= (64<<levels)-1;
  94         }
  95         else
  96         {
  97                 for(unsigned i=0; i<6; ++i)
  98                         image(enumerate_faces(i), level, 0);
  99         }
 100 }
 101
 102 void TextureCube::image(TextureCubeFace face, unsigned level, const void *data)
 103 {
 104         if(size==0)
 105                 throw invalid_operation("TextureCube::image");
 106
 107         unsigned s = get_level_size(level);
 108         if(s==0)
 109                 throw out_of_range("TextureCube::image");
 110
 111         if(ARB_texture_storage)
 112                 return sub_image(face, level, 0, 0, s, s, data);
 113
 114         BindRestore _bind(this);
 115
 116         if(!allocated)
 117         {
 118                 glTexParameteri(target, GL_TEXTURE_MAX_LEVEL, levels-1);
 119                 apply_swizzle();
 120         }
 121
 122         PixelComponents comp = get_components(storage_fmt);
 123         GLenum type = get_gl_type(get_component_type(storage_fmt));
 124         glTexImage2D(face, level, storage_fmt, s, s, 0, comp, type, data);
 125
 126         if(level==0)
 127         {
 128                 allocated |= 1<<get_face_index(face);
 129                 if((allocated&63)==63)
 130                 {
 131                         allocated |= 64;
 132                         if(auto_gen_mipmap)
 133                         {
 134                                 generate_mipmap();
 135                                 allocated |= (64<<levels)-1;
 136                         }
 137                 }
 138         }
 139         else if(!(allocated&(64<<level)))
 140         {
 141                 for(unsigned i=0; i<6; ++i)
 142                         if(enumerate_faces(i)!=face)
 143                                 glTexImage2D(enumerate_faces(i), level, storage_fmt, s, s, 0, comp, type, 0);
 144
 145                 allocated |= 64<<level;
 146         }
 147 }
 148
 149 void TextureCube::image(TextureCubeFace face, unsigned level, PixelComponents comp, DataType type, const void *data)
 150 {
 151         if(comp!=get_components(format) || type!=get_component_type(format))
 152                 throw incompatible_data("TextureCube::image");
 153         image(face, level, data);
 154 }
 155
 156 void TextureCube::sub_image(TextureCubeFace face, unsigned level, int x, int y, unsigned wd, unsigned ht, const void *data)
 157 {
 158         if(size==0)
 159                 throw invalid_operation("TextureCube::sub_image");
 160
 161         Conditional<BindRestore> _bind(!ARB_direct_state_acess, this);
 162         allocate(level);
 163
 164         PixelComponents comp = get_components(storage_fmt);
 165         GLenum type = get_gl_type(get_component_type(storage_fmt));
 166         if(ARB_direct_state_access)
 167                 glTextureSubImage3D(id, level, x, y, get_face_index(face), wd, ht, 1, comp, type, data);
 168         else
 169                 glTexSubImage2D(face, level, x, y, wd, ht, comp, type, data);
 170
 171         if(auto_gen_mipmap && level==0)
 172                 generate_mipmap();
 173 }
 174
 175 void TextureCube::sub_image(TextureCubeFace face, unsigned level, int x, int y, unsigned wd, unsigned ht, PixelComponents comp, DataType type, const void *data)
 176 {
 177         if(comp!=get_components(format) || type!=get_component_type(format))
 178                 throw incompatible_data("TextureCube::subimage");
 179         sub_image(face, level, x, y, wd, ht, data);
 180 }
 181
 182 void TextureCube::image(TextureCubeFace face, const Graphics::Image &img)
 183 {
 184         unsigned w = img.get_width();
 185         unsigned h = img.get_height();
 186         if(w!=h)
 187                 throw incompatible_data("TextureCube::image");
 188
 189         PixelFormat fmt = pixelformat_from_image(img);
 190         storage(make_pixelformat(get_components(fmt), get_component_type(fmt), use_srgb_format), w);
 191
 192         PixelStore pstore = PixelStore::from_image(img);
 193         BindRestore _bind_ps(pstore);
 194
 195         image(face, 0, img.get_pixels());
 196 }
 197
 198 void TextureCube::image(TextureCubeFace face, const Graphics::Image &img, bool)
 199 {
 200         image(face, img);
 201 }
 202
 203 void TextureCube::image(const Graphics::Image &img, unsigned lv)
 204 {
 205         unsigned w = img.get_width();
 206         unsigned h = img.get_height();
 207
 208         if(h!=w*6)
 209                 throw incompatible_data("TextureCube::image");
 210         h /= 6;
 211
 212         PixelFormat fmt = pixelformat_from_image(img);
 213         if(size==0)
 214                 storage(make_pixelformat(get_components(fmt), get_component_type(fmt), use_srgb_format), w, lv);
 215         else if(w!=size || h!=size)
 216                 throw incompatible_data("TextureCube::image");
 217
 218         PixelStore pstore = PixelStore::from_image(img);
 219         BindRestore _bind_ps(pstore);
 220
 221         const char *pixels = reinterpret_cast<const char *>(img.get_pixels());
 222         unsigned face_size = img.get_stride()*size;
 223         for(unsigned i=0; i<6; ++i)
 224                 image(enumerate_faces(i), 0, pixels+i*face_size);
 225 }
 226
 227 unsigned TextureCube::get_n_levels() const
 228 {
 229         unsigned n = 0;
 230         for(unsigned s=size; s; s>>=1, ++n) ;
 231         return n;
 232 }
 233
 234 unsigned TextureCube::get_level_size(unsigned level) const
 235 {
 236         return size>>level;
 237 }
 238
 239 TextureCubeFace TextureCube::enumerate_faces(unsigned i)
 240 {
 241         if(i>=6)
 242                 throw out_of_range("TextureCube::enumerate_faces");
 243         return face_order[i];
 244 }
 245
 246 unsigned TextureCube::get_face_index(TextureCubeFace face)
 247 {
 248         switch(face)
 249         {
 250         case POSITIVE_X: return 0;
 251         case NEGATIVE_X: return 1;
 252         case POSITIVE_Y: return 2;
 253         case NEGATIVE_Y: return 3;
 254         case POSITIVE_Z: return 4;
 255         case NEGATIVE_Z: return 5;
 256         default: throw invalid_argument("TextureCube::get_face_index");
 257         }
 258 }
 259
 260 const Vector3 &TextureCube::get_face_direction(TextureCubeFace face)
 261 {
 262         return directions[get_face_index(face)];
 263 }
 264
 265 const Vector3 &TextureCube::get_s_direction(TextureCubeFace face)
 266 {
 267         return directions[orientations[get_face_index(face)*2]];
 268 }
 269
 270 const Vector3 &TextureCube::get_t_direction(TextureCubeFace face)
 271 {
 272         return directions[orientations[get_face_index(face)*2+1]];
 273 }
 274
 275 Vector3 TextureCube::get_texel_direction(TextureCubeFace face, unsigned u, unsigned v)
 276 {
 277         float s = (u+0.5f)*2.0f/size-1.0f;
 278         float t = (v+0.5f)*2.0f/size-1.0f;
 279         const Vector3 &fv = get_face_direction(face);
 280         const Vector3 &sv = get_s_direction(face);
 281         const Vector3 &tv = get_t_direction(face);
 282         return fv+s*sv+t*tv;
 283 }
 284
 285 UInt64 TextureCube::get_data_size() const
 286 {
 287         return id ? size*size*6*get_pixel_size(storage_fmt) : 0;
 288 }
 289
 290
 291 TextureCube::Loader::Loader(TextureCube &t):
 292         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t)
 293 {
 294         init();
 295 }
 296
 297 TextureCube::Loader::Loader(TextureCube &t, Collection &c):
 298         DataFile::DerivedObjectLoader<TextureCube, Texture::Loader>(t, c)
 299 {
 300         init();
 301 }
 302
 303 void TextureCube::Loader::init()
 304 {
 305         add("external_image", &Loader::external_image);
 306         add("image_data", &Loader::image_data);
 307         add("raw_data", &Loader::raw_data);
 308         add("storage", &Loader::storage);
 309         add("storage", &Loader::storage_levels);
 310 }
 311
 312 void TextureCube::Loader::external_image(TextureCubeFace face, const string &fn)
 313 {
 314         Graphics::Image img;
 315         RefPtr<IO::Seekable> io = get_collection().open_raw(fn);
 316         img.load_io(*io);
 317
 318         obj.image(face, img);
 319 }
 320
 321 void TextureCube::Loader::image_data(TextureCubeFace face, const string &data)
 322 {
 323         Graphics::Image img;
 324         IO::Memory mem(data.data(), data.size());
 325         img.load_io(mem);
 326
 327         obj.image(face, img);
 328 }
 329
 330 void TextureCube::Loader::raw_data(TextureCubeFace face, const string &data)
 331 {
 332         obj.image(face, 0, data.data());
 333 }
 334
 335 void TextureCube::Loader::storage(PixelFormat fmt, unsigned s)
 336 {
 337         obj.storage(fmt, s);
 338 }
 339
 340 void TextureCube::Loader::storage_levels(PixelFormat fmt, unsigned s, unsigned l)
 341 {
 342         obj.storage(fmt, s, l);
 343 }
 344
 345
 346 void operator>>(const LexicalConverter &conv, TextureCubeFace &face)
 347 {
 348         const string &str = conv.get();
 349         if(str=="POSITIVE_X")
 350                 face = POSITIVE_X;
 351         else if(str=="NEGATIVE_X")
 352                 face = NEGATIVE_X;
 353         else if(str=="POSITIVE_Y")
 354                 face = POSITIVE_Y;
 355         else if(str=="NEGATIVE_Y")
 356                 face = NEGATIVE_Y;
 357         else if(str=="POSITIVE_Z")
 358                 face = POSITIVE_Z;
 359         else if(str=="NEGATIVE_Z")
 360                 face = NEGATIVE_Z;
 361         else
 362                 throw lexical_error(format("conversion of '%s' to TextureCubeFace", str));
 363 }
 364
 365 } // namespace GL
 366 } // namespace Msp